Study Overview

The objective of this study was to investigate the affect of camera height as a function of volume width on lower limb kinematics during normal walking using Theia3D. Video data was recorded for 9 subjects using 32 Sony RX0II cameras and processed in Theia3D (v2023.1.0.3161p9, model v10.0.0, 3DOF knee, 8 Hz cutoff frequency).

Camera Heights and Volume widths

Camera Heights
The 32 cameras were placed in a standard ellipse-like configuration (see Figure 1). Cameras were placed at 4 heights for each camera location:

Group 0 included all 32 cameras during processing.

Volume Width
For each width the cameras were moved and re-aimed to get the subject in all camera views as much as possible given the width constraints.

Width 1 was the standard HMRL volume length (~13.8m Long) and width. Width 2 and 3 were narrower. With width 3 trying to simulate hallway.

A 5th and 6th group were added to Width 3 since the sagittal cameras for groups 1 and 2 could not get the full subjects. The sagittal cameras were replaced with videos from group 3.

Width 1 Camera Groupings.

Calibration
A single calibration was performed for each width with all 32 cameras. Separate calibration files were then built by extracting the cameras for each group.

Ensemble average plots by camera height (group) and volume width.

Data only shown for Right Leg.
The plots are interactive:

Draft interpretations per Jereme and Rob: